Lapis Lazuli Talisman

Watch the stack for a blue spell, then pay three mana, and a single permanent untaps. That is the entire transaction this artifact offers, and the exchange rate is what dooms it: the trigger keys off spell color rather than anything you control, so you either supply the blue spells yourself (paying full price to cast and three more to act on the trigger) or you wait on an opponent's blue deck and let them set the schedule. The untap is generic and incidental, hitting any permanent including a land or a tapped attacker, but no amount of flexibility on the target rescues a cost that swallows the reward. It belonged to an Ice Age cluster of color-watching artifacts that bet on metagames flooded with a single color, a wager that never cashed because acting on the watch was priced like a spell of its own. What lingers is the design lesson buried in the math: taxing a colored mana symbol on the stack as if it were a resource sounds clever until you total the cost of caring, and three mana on top of a narrow trigger leaves the idea stranded well short of any reason to run it.